[SOLVED] SAT Math

Hi
This is on page 870 #12 on the OB Book.

If the degree measures of the angles of a triangle are in the ration of 2:3:4, by how many degrees does the measure of the largest angle exceed the measure of the smallest angle? (please show steps! thanks!!)

If the degree measures of the angles of a triangle are in the ration of 2:3:4, by how many degrees does the measure of the largest angle exceed the measure of the smallest angle? (please show steps! thanks!!)